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looks like a tap extractor
You've unknowingly kicked a huge hornet's nest there, zmb. If you watch the video closely, you'll notice he states, "these are UL-Listed connectors, no pre-twisting of the wires is required." Among professional electricians, there's much controvery/debate over whether one should twist before installing nut. One of many threads on the topic (this example is >70 posts): Do you twist your solid wires together before you put them in a wirenut? - Mike Holt's Forum. .
handy as long as the tap needing extracting is big enough to be extracted
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